Notes On Using 16-Bit Ppg Timer - Fujitsu MB95630H Series Hardware Manual

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CHAPTER 19 16-BIT PPG TIMER

19.8 Notes on Using 16-bit PPG Timer

Notes on Using 16-bit PPG Timer

This section provides notes on using the 16-bit PPG timer.

■ Notes on Using 16-bit PPG Timer

● Notes on setting the program

Do not use the retrigger if the same values are set for the cycle and duty. If used, the PPG

output will go to the "L" level for one count clock cycle after the retrigger, and then go back to

the "H" level when normal polarity has been selected.

If the microcontroller enters a standby mode, the TRGn pin setting may change and cause the

device to malfunction. Therefore, disable the timer enable bit (PCNTHn:CNTE = 0) or disable

the hardware trigger enable bit (PCNTLn:EGS1 = 0, EGS0 = 0).

When the cycle and duty are set to the same value, an interrupt is generated only once by duty

match. Moreover, if the duty is set to a value greater than the value of the period, no interrupt

will be generated by a duty match.

While the 16-bit timer is counting, and the software retrigger function is enabled

(PCNTHn:RTRG = 1) and the retrigger is selected an interrupt source (PCNTLn:IRS[1:0] =

0b00), never disable the 16-bit PPG timer operation (PCNTHn:CNTE = 0) and enable the

software trigger (PCNTHn:STRG = 1) at the same time. Otherwise, even though the 16-bit

PPG timer stops operating, the interrupt flag bit may be set by a retrigger.

FUJITSU SEMICONDUCTOR LIMITED

MB95630H Series

MN702-00009-1v0-E